Uranyl iodide

Uranyl iodide

Names
Other names Uranium(VI) iodide oxide Uranium diiodide dioxide
Identifiers
Properties
Chemical formula	UO2I2
Molar mass	523.836 g·mol−1
Appearance	red crystals [1]
Related compounds
Other anions	Uranyl bromide Uranyl chloride Uranyl fluoride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Uranyl iodide is an compound of uranium, oxygen, and iodine with the chemical formula UO₂I₂. ^{[2] [3]}

Synthesis

Uranyl iodide can be obtained by treating UO₂(OTf)₂ with pure Me₃SiI. ^[4]

Also, uranyl iodide can be prepared by reduction of uranyl iodate with aqueous sulphur dioxide (Richards and Merigold, 1902) and by double decomposition of uranyl sulphate and barium or calcium iodide (Truttwinn, 1925; Lynds, 1962). ^[5]

Also, the compound can be prepared by adding barium iodide in excess to an ethereal solution of uranyl nitrate. ^[1]

Chemical properties

The compound reacts with water and oxygen to produce uranyl hydroxide: ^[6]

UO₂I₂ + H₂O + 1/₂O₂ → UO₂(OH)₂ + I₂

References

1. Vallance, Reece H.; Eldridge, Arthur A. (1926). Chromium and Its Congeners. Griffin. p. 299. Retrieved 4 October 2025.
2. Cotton, S. A. (15 December 2005). "16 Scandium, yttrium, the lanthanides and the actinides". Annual Reports Section 'A' (Inorganic Chemistry). 101 (0): 294–318. doi:10.1039/B410468B. ISSN   1460-4760 . Retrieved 4 October 2025.
3. Prins, G; Cordfunke, E. H. P; Ouweltjes, W (1 October 1978). "Standard enthalpies of formation of uranium compounds V. UO2Br2, UO2Br2·H2O, UO2Br2·3H2O, and UO2(OH)Br·2H2O A comment on the stability of uranyl iodide and its hydrates". The Journal of Chemical Thermodynamics . 10 (10): 1003–1010. doi:10.1016/0021-9614(78)90062-9. ISSN   0021-9614 . Retrieved 4 October 2025.
4. Berthet, Jean-Claude; Nierlich, Martine; Ephritikhine, Michel (24 March 2004). "Synthesis of the stable UO2I2, the last of the uranyl dihalides. X-Ray crystal structure of [UO2I2(py)3]". Chemical Communications (7): 870–871. doi:10.1039/B400717D. ISSN   1364-548X . Retrieved 4 October 2025.
5. Gutmann, Viktor (2 December 2012). Halogen Chemistry. Elsevier. p. 367. ISBN   978-0-323-14847-4 . Retrieved 4 October 2025.
6. Rabinowitch, Eugene (1954). Photochemistry of Uranyl Compounds. U.S. Atomic Energy Commission. p. 17. Retrieved 4 October 2025.